Mercurial > hg > truffle
annotate src/share/vm/opto/regmask.cpp @ 14714:b602356a9cfc
additional canonicalizers for accesses and value nodes (improves number of implicit null checks)
author | Lukas Stadler <lukas.stadler@oracle.com> |
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date | Thu, 20 Mar 2014 17:15:36 +0100 |
parents | d2907f74462e |
children | 4ca6dc0799b6 78bbf4d43a14 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "opto/compile.hpp" | |
27 #include "opto/regmask.hpp" | |
28 #ifdef TARGET_ARCH_MODEL_x86_32 | |
29 # include "adfiles/ad_x86_32.hpp" | |
30 #endif | |
31 #ifdef TARGET_ARCH_MODEL_x86_64 | |
32 # include "adfiles/ad_x86_64.hpp" | |
33 #endif | |
34 #ifdef TARGET_ARCH_MODEL_sparc | |
35 # include "adfiles/ad_sparc.hpp" | |
36 #endif | |
37 #ifdef TARGET_ARCH_MODEL_zero | |
38 # include "adfiles/ad_zero.hpp" | |
39 #endif | |
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40 #ifdef TARGET_ARCH_MODEL_arm |
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41 # include "adfiles/ad_arm.hpp" |
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42 #endif |
14391 | 43 #ifdef TARGET_ARCH_MODEL_ppc_32 |
44 # include "adfiles/ad_ppc_32.hpp" | |
45 #endif | |
46 #ifdef TARGET_ARCH_MODEL_ppc_64 | |
47 # include "adfiles/ad_ppc_64.hpp" | |
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48 #endif |
0 | 49 |
50 #define RM_SIZE _RM_SIZE /* a constant private to the class RegMask */ | |
51 | |
52 //-------------Non-zero bit search methods used by RegMask--------------------- | |
53 // Find lowest 1, or return 32 if empty | |
54 int find_lowest_bit( uint32 mask ) { | |
55 int n = 0; | |
56 if( (mask & 0xffff) == 0 ) { | |
57 mask >>= 16; | |
58 n += 16; | |
59 } | |
60 if( (mask & 0xff) == 0 ) { | |
61 mask >>= 8; | |
62 n += 8; | |
63 } | |
64 if( (mask & 0xf) == 0 ) { | |
65 mask >>= 4; | |
66 n += 4; | |
67 } | |
68 if( (mask & 0x3) == 0 ) { | |
69 mask >>= 2; | |
70 n += 2; | |
71 } | |
72 if( (mask & 0x1) == 0 ) { | |
73 mask >>= 1; | |
74 n += 1; | |
75 } | |
76 if( mask == 0 ) { | |
77 n = 32; | |
78 } | |
79 return n; | |
80 } | |
81 | |
82 // Find highest 1, or return 32 if empty | |
83 int find_hihghest_bit( uint32 mask ) { | |
84 int n = 0; | |
85 if( mask > 0xffff ) { | |
86 mask >>= 16; | |
87 n += 16; | |
88 } | |
89 if( mask > 0xff ) { | |
90 mask >>= 8; | |
91 n += 8; | |
92 } | |
93 if( mask > 0xf ) { | |
94 mask >>= 4; | |
95 n += 4; | |
96 } | |
97 if( mask > 0x3 ) { | |
98 mask >>= 2; | |
99 n += 2; | |
100 } | |
101 if( mask > 0x1 ) { | |
102 mask >>= 1; | |
103 n += 1; | |
104 } | |
105 if( mask == 0 ) { | |
106 n = 32; | |
107 } | |
108 return n; | |
109 } | |
110 | |
111 //------------------------------dump------------------------------------------- | |
112 | |
113 #ifndef PRODUCT | |
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114 void OptoReg::dump(int r, outputStream *st) { |
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115 switch (r) { |
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116 case Special: st->print("r---"); break; |
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117 case Bad: st->print("rBAD"); break; |
0 | 118 default: |
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119 if (r < _last_Mach_Reg) st->print(Matcher::regName[r]); |
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120 else st->print("rS%d",r); |
0 | 121 break; |
122 } | |
123 } | |
124 #endif | |
125 | |
126 | |
127 //============================================================================= | |
128 const RegMask RegMask::Empty( | |
129 # define BODY(I) 0, | |
130 FORALL_BODY | |
131 # undef BODY | |
132 0 | |
133 ); | |
134 | |
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135 //============================================================================= |
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136 bool RegMask::is_vector(uint ireg) { |
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137 return (ireg == Op_VecS || ireg == Op_VecD || ireg == Op_VecX || ireg == Op_VecY); |
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138 } |
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139 |
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140 int RegMask::num_registers(uint ireg) { |
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141 switch(ireg) { |
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142 case Op_VecY: |
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143 return 8; |
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144 case Op_VecX: |
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145 return 4; |
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146 case Op_VecD: |
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147 case Op_RegD: |
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148 case Op_RegL: |
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149 #ifdef _LP64 |
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150 case Op_RegP: |
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151 #endif |
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152 return 2; |
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153 } |
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154 // Op_VecS and the rest ideal registers. |
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155 return 1; |
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156 } |
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157 |
0 | 158 //------------------------------find_first_pair-------------------------------- |
159 // Find the lowest-numbered register pair in the mask. Return the | |
160 // HIGHEST register number in the pair, or BAD if no pairs. | |
161 OptoReg::Name RegMask::find_first_pair() const { | |
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162 verify_pairs(); |
0 | 163 for( int i = 0; i < RM_SIZE; i++ ) { |
164 if( _A[i] ) { // Found some bits | |
165 int bit = _A[i] & -_A[i]; // Extract low bit | |
166 // Convert to bit number, return hi bit in pair | |
167 return OptoReg::Name((i<<_LogWordBits)+find_lowest_bit(bit)+1); | |
168 } | |
169 } | |
170 return OptoReg::Bad; | |
171 } | |
172 | |
173 //------------------------------ClearToPairs----------------------------------- | |
174 // Clear out partial bits; leave only bit pairs | |
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175 void RegMask::clear_to_pairs() { |
0 | 176 for( int i = 0; i < RM_SIZE; i++ ) { |
177 int bits = _A[i]; | |
178 bits &= ((bits & 0x55555555)<<1); // 1 hi-bit set for each pair | |
179 bits |= (bits>>1); // Smear 1 hi-bit into a pair | |
180 _A[i] = bits; | |
181 } | |
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182 verify_pairs(); |
0 | 183 } |
184 | |
185 //------------------------------SmearToPairs----------------------------------- | |
186 // Smear out partial bits; leave only bit pairs | |
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187 void RegMask::smear_to_pairs() { |
0 | 188 for( int i = 0; i < RM_SIZE; i++ ) { |
189 int bits = _A[i]; | |
190 bits |= ((bits & 0x55555555)<<1); // Smear lo bit hi per pair | |
191 bits |= ((bits & 0xAAAAAAAA)>>1); // Smear hi bit lo per pair | |
192 _A[i] = bits; | |
193 } | |
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194 verify_pairs(); |
0 | 195 } |
196 | |
197 //------------------------------is_aligned_pairs------------------------------- | |
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198 bool RegMask::is_aligned_pairs() const { |
0 | 199 // Assert that the register mask contains only bit pairs. |
200 for( int i = 0; i < RM_SIZE; i++ ) { | |
201 int bits = _A[i]; | |
202 while( bits ) { // Check bits for pairing | |
203 int bit = bits & -bits; // Extract low bit | |
204 // Low bit is not odd means its mis-aligned. | |
205 if( (bit & 0x55555555) == 0 ) return false; | |
206 bits -= bit; // Remove bit from mask | |
207 // Check for aligned adjacent bit | |
208 if( (bits & (bit<<1)) == 0 ) return false; | |
209 bits -= (bit<<1); // Remove other halve of pair | |
210 } | |
211 } | |
212 return true; | |
213 } | |
214 | |
215 //------------------------------is_bound1-------------------------------------- | |
216 // Return TRUE if the mask contains a single bit | |
217 int RegMask::is_bound1() const { | |
218 if( is_AllStack() ) return false; | |
219 int bit = -1; // Set to hold the one bit allowed | |
220 for( int i = 0; i < RM_SIZE; i++ ) { | |
221 if( _A[i] ) { // Found some bits | |
222 if( bit != -1 ) return false; // Already had bits, so fail | |
223 bit = _A[i] & -_A[i]; // Extract 1 bit from mask | |
224 if( bit != _A[i] ) return false; // Found many bits, so fail | |
225 } | |
226 } | |
227 // True for both the empty mask and for a single bit | |
228 return true; | |
229 } | |
230 | |
231 //------------------------------is_bound2-------------------------------------- | |
232 // Return TRUE if the mask contains an adjacent pair of bits and no other bits. | |
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233 int RegMask::is_bound_pair() const { |
0 | 234 if( is_AllStack() ) return false; |
235 | |
236 int bit = -1; // Set to hold the one bit allowed | |
237 for( int i = 0; i < RM_SIZE; i++ ) { | |
238 if( _A[i] ) { // Found some bits | |
239 if( bit != -1 ) return false; // Already had bits, so fail | |
240 bit = _A[i] & -(_A[i]); // Extract 1 bit from mask | |
241 if( (bit << 1) != 0 ) { // Bit pair stays in same word? | |
242 if( (bit | (bit<<1)) != _A[i] ) | |
243 return false; // Require adjacent bit pair and no more bits | |
244 } else { // Else its a split-pair case | |
245 if( bit != _A[i] ) return false; // Found many bits, so fail | |
246 i++; // Skip iteration forward | |
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247 if( i >= RM_SIZE || _A[i] != 1 ) |
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248 return false; // Require 1 lo bit in next word |
0 | 249 } |
250 } | |
251 } | |
252 // True for both the empty mask and for a bit pair | |
253 return true; | |
254 } | |
255 | |
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256 static int low_bits[3] = { 0x55555555, 0x11111111, 0x01010101 }; |
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257 //------------------------------find_first_set--------------------------------- |
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258 // Find the lowest-numbered register set in the mask. Return the |
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259 // HIGHEST register number in the set, or BAD if no sets. |
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260 // Works also for size 1. |
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261 OptoReg::Name RegMask::find_first_set(const int size) const { |
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262 verify_sets(size); |
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263 for (int i = 0; i < RM_SIZE; i++) { |
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264 if (_A[i]) { // Found some bits |
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265 int bit = _A[i] & -_A[i]; // Extract low bit |
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266 // Convert to bit number, return hi bit in pair |
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267 return OptoReg::Name((i<<_LogWordBits)+find_lowest_bit(bit)+(size-1)); |
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268 } |
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269 } |
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270 return OptoReg::Bad; |
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271 } |
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272 |
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273 //------------------------------clear_to_sets---------------------------------- |
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274 // Clear out partial bits; leave only aligned adjacent bit pairs |
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275 void RegMask::clear_to_sets(const int size) { |
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276 if (size == 1) return; |
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277 assert(2 <= size && size <= 8, "update low bits table"); |
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278 assert(is_power_of_2(size), "sanity"); |
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279 int low_bits_mask = low_bits[size>>2]; |
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280 for (int i = 0; i < RM_SIZE; i++) { |
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281 int bits = _A[i]; |
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282 int sets = (bits & low_bits_mask); |
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283 for (int j = 1; j < size; j++) { |
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284 sets = (bits & (sets<<1)); // filter bits which produce whole sets |
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285 } |
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286 sets |= (sets>>1); // Smear 1 hi-bit into a set |
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287 if (size > 2) { |
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288 sets |= (sets>>2); // Smear 2 hi-bits into a set |
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289 if (size > 4) { |
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290 sets |= (sets>>4); // Smear 4 hi-bits into a set |
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291 } |
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292 } |
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293 _A[i] = sets; |
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294 } |
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295 verify_sets(size); |
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296 } |
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297 |
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298 //------------------------------smear_to_sets---------------------------------- |
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299 // Smear out partial bits to aligned adjacent bit sets |
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300 void RegMask::smear_to_sets(const int size) { |
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301 if (size == 1) return; |
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302 assert(2 <= size && size <= 8, "update low bits table"); |
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303 assert(is_power_of_2(size), "sanity"); |
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304 int low_bits_mask = low_bits[size>>2]; |
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305 for (int i = 0; i < RM_SIZE; i++) { |
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306 int bits = _A[i]; |
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307 int sets = 0; |
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308 for (int j = 0; j < size; j++) { |
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309 sets |= (bits & low_bits_mask); // collect partial bits |
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310 bits = bits>>1; |
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311 } |
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312 sets |= (sets<<1); // Smear 1 lo-bit into a set |
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313 if (size > 2) { |
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314 sets |= (sets<<2); // Smear 2 lo-bits into a set |
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315 if (size > 4) { |
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316 sets |= (sets<<4); // Smear 4 lo-bits into a set |
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317 } |
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318 } |
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319 _A[i] = sets; |
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320 } |
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321 verify_sets(size); |
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322 } |
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323 |
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324 //------------------------------is_aligned_set-------------------------------- |
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325 bool RegMask::is_aligned_sets(const int size) const { |
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326 if (size == 1) return true; |
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327 assert(2 <= size && size <= 8, "update low bits table"); |
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328 assert(is_power_of_2(size), "sanity"); |
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329 int low_bits_mask = low_bits[size>>2]; |
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330 // Assert that the register mask contains only bit sets. |
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331 for (int i = 0; i < RM_SIZE; i++) { |
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332 int bits = _A[i]; |
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333 while (bits) { // Check bits for pairing |
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334 int bit = bits & -bits; // Extract low bit |
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335 // Low bit is not odd means its mis-aligned. |
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336 if ((bit & low_bits_mask) == 0) return false; |
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337 // Do extra work since (bit << size) may overflow. |
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338 int hi_bit = bit << (size-1); // high bit |
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339 int set = hi_bit + ((hi_bit-1) & ~(bit-1)); |
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340 // Check for aligned adjacent bits in this set |
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341 if ((bits & set) != set) return false; |
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342 bits -= set; // Remove this set |
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343 } |
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344 } |
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345 return true; |
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346 } |
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347 |
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348 //------------------------------is_bound_set----------------------------------- |
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349 // Return TRUE if the mask contains one adjacent set of bits and no other bits. |
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350 // Works also for size 1. |
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351 int RegMask::is_bound_set(const int size) const { |
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352 if( is_AllStack() ) return false; |
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353 assert(1 <= size && size <= 8, "update low bits table"); |
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354 int bit = -1; // Set to hold the one bit allowed |
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355 for (int i = 0; i < RM_SIZE; i++) { |
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356 if (_A[i] ) { // Found some bits |
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357 if (bit != -1) |
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358 return false; // Already had bits, so fail |
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359 bit = _A[i] & -_A[i]; // Extract low bit from mask |
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360 int hi_bit = bit << (size-1); // high bit |
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361 if (hi_bit != 0) { // Bit set stays in same word? |
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362 int set = hi_bit + ((hi_bit-1) & ~(bit-1)); |
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363 if (set != _A[i]) |
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364 return false; // Require adjacent bit set and no more bits |
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365 } else { // Else its a split-set case |
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366 if (((-1) & ~(bit-1)) != _A[i]) |
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367 return false; // Found many bits, so fail |
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368 i++; // Skip iteration forward and check high part |
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369 // The lower 24 bits should be 0 since it is split case and size <= 8. |
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370 int set = bit>>24; |
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371 set = set & -set; // Remove sign extension. |
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372 set = (((set << size) - 1) >> 8); |
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373 if (i >= RM_SIZE || _A[i] != set) |
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374 return false; // Require expected low bits in next word |
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375 } |
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376 } |
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377 } |
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378 // True for both the empty mask and for a bit set |
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379 return true; |
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380 } |
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381 |
0 | 382 //------------------------------is_UP------------------------------------------ |
383 // UP means register only, Register plus stack, or stack only is DOWN | |
384 bool RegMask::is_UP() const { | |
385 // Quick common case check for DOWN (any stack slot is legal) | |
386 if( is_AllStack() ) | |
387 return false; | |
388 // Slower check for any stack bits set (also DOWN) | |
389 if( overlap(Matcher::STACK_ONLY_mask) ) | |
390 return false; | |
391 // Not DOWN, so must be UP | |
392 return true; | |
393 } | |
394 | |
395 //------------------------------Size------------------------------------------- | |
396 // Compute size of register mask in bits | |
397 uint RegMask::Size() const { | |
398 extern uint8 bitsInByte[256]; | |
399 uint sum = 0; | |
400 for( int i = 0; i < RM_SIZE; i++ ) | |
401 sum += | |
402 bitsInByte[(_A[i]>>24) & 0xff] + | |
403 bitsInByte[(_A[i]>>16) & 0xff] + | |
404 bitsInByte[(_A[i]>> 8) & 0xff] + | |
405 bitsInByte[ _A[i] & 0xff]; | |
406 return sum; | |
407 } | |
408 | |
409 #ifndef PRODUCT | |
410 //------------------------------print------------------------------------------ | |
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411 void RegMask::dump(outputStream *st) const { |
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412 st->print("["); |
0 | 413 RegMask rm = *this; // Structure copy into local temp |
414 | |
415 OptoReg::Name start = rm.find_first_elem(); // Get a register | |
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416 if (OptoReg::is_valid(start)) { // Check for empty mask |
0 | 417 rm.Remove(start); // Yank from mask |
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418 OptoReg::dump(start, st); // Print register |
0 | 419 OptoReg::Name last = start; |
420 | |
421 // Now I have printed an initial register. | |
422 // Print adjacent registers as "rX-rZ" instead of "rX,rY,rZ". | |
423 // Begin looping over the remaining registers. | |
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424 while (1) { // |
0 | 425 OptoReg::Name reg = rm.find_first_elem(); // Get a register |
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426 if (!OptoReg::is_valid(reg)) |
0 | 427 break; // Empty mask, end loop |
428 rm.Remove(reg); // Yank from mask | |
429 | |
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430 if (last+1 == reg) { // See if they are adjacent |
0 | 431 // Adjacent registers just collect into long runs, no printing. |
432 last = reg; | |
433 } else { // Ending some kind of run | |
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434 if (start == last) { // 1-register run; no special printing |
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435 } else if (start+1 == last) { |
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436 st->print(","); // 2-register run; print as "rX,rY" |
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437 OptoReg::dump(last, st); |
0 | 438 } else { // Multi-register run; print as "rX-rZ" |
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439 st->print("-"); |
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440 OptoReg::dump(last, st); |
0 | 441 } |
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442 st->print(","); // Seperate start of new run |
0 | 443 start = last = reg; // Start a new register run |
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444 OptoReg::dump(start, st); // Print register |
0 | 445 } // End of if ending a register run or not |
446 } // End of while regmask not empty | |
447 | |
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448 if (start == last) { // 1-register run; no special printing |
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449 } else if (start+1 == last) { |
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450 st->print(","); // 2-register run; print as "rX,rY" |
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451 OptoReg::dump(last, st); |
0 | 452 } else { // Multi-register run; print as "rX-rZ" |
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453 st->print("-"); |
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454 OptoReg::dump(last, st); |
0 | 455 } |
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456 if (rm.is_AllStack()) st->print("..."); |
0 | 457 } |
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458 st->print("]"); |
0 | 459 } |
460 #endif |